A Quick Look at the $3\,$GHz Radio Sky I. Source Statistics from the Very Large Array Sky Survey
Yjan A. Gordon, Michelle M. Boyce, Christopher P. O'Dea, Lawrence Rudnick, Heinz Andernach, Adrian N. Vantyghem, Stefi A. Baum, Jean-Paul Bui, Mathew Dionyssiou… 展开作者
Yjan A. Gordon, Michelle M. Boyce, Christopher P. O'Dea, Lawrence Rudnick, Heinz Andernach, Adrian N. Vantyghem, Stefi A. Baum, Jean-Paul Bui, Mathew Dionyssiou, Samar Safi-Harb, Isabel Sander
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Accepted for publication in ApJS; 23 pages, 18 figures, 4 tables. Revised version includes new flux calibration (section 3.2) that results in VLASS fluxes being scaled by 15% in the presented analyses rather than the 10% used in the earlier version. Associated VLASS catalog data available at https://cirada.ca/catalogues
The Very Large Array Sky Survey (VLASS) is observing the entire sky north of $-40^{\circ}$ in the S-band ($2<ν<4\,$GHz), with the highest angular resolution ($2''.5$) of any all-sky radio continuum survey to date. VLASS will cover its entire footprint over three distinct epochs, the first of which has now been observed in full. Based on Quick Look images from this first epoch, we have created a catalog of $1.9\times10^{6}$ reliably detected radio components. Due to the limitations of the Quick Look images, component flux densities are underestimated by $\sim 15\,\%$ at $S_{\text{peak}}>3\,$mJy/beam and are often unreliable for fainter components. We use this catalog to perform statistical analyses of the $ν\sim 3\,$GHz radio sky. Comparisons with the Faint Images of the Radio Sky at Twenty cm survey (FIRST) show the typical $1.4-3\,$GHz spectral index, $α$, to be $\sim-0.71$. The radio color-color distribution of point and extended components is explored by matching with FIRST and the LOFAR Two Meter Sky Survey. We present the VLASS source counts, $dN/dS$, which are found to be consistent with previous observations at $1.4$ and $3\,$GHz. Resolution improvements over FIRST result in excess power in the VLASS two-point correlation function at angular scales $\lesssim 7''$, and in $18\,\%$ of active galactic nuclei associated with a single FIRST component being split into multi-component sources by VLASS.
All-sky modeling of Galactic emission at radio and microwave frequencies
The University of Manchester（曼彻斯特大学）；Instituto de Astrofísica de Canarias（加那利天体物理研究所）；Universidad de La Laguna（拉古纳大学）；University of Oslo（奥斯陆大学）；University of Cambridge（剑桥大学）；University of Oxford（牛津大学）
A comparison between Galactic magnetic field models and polarized synchrotron emission with C-BASS at 4.76 GHz and S-PASS at 2.3 GHz
The University of Manchester（曼彻斯特大学）；FIZ Karlsruhe – Leibniz-Institute for Information Infrastructure（卡尔斯鲁厄FIZ–莱布尼茨信息基础设施研究所）；Instituto de Astrofísica de Canarias（加那利群岛天体物理研究所）；University of Oxford（牛津大学）
通过比较当代银河磁场模型与S-PASS和C-BASS巡天的偏振同步辐射观测，评估模型在重现偏振幅度和偏振角方面的能力，发现大多数模型在大尺度偏振角上表现良好，但无法再现偏振强度的形态，并指出局部结构（如北银极 Spur/Loop I 和 Fan 区域）对微波偏振同步辐射建模至关重要。
Water abundance in four of the brightest water sources in the southern sky
We estimated the ortho-{ \rm{H$_2$O} } abundances of G267.9--1.1, G268.4--0.9, G333.1--0.4 and G336.5--1.5, four of the brightest ortho-{ \rm{H$_2$O} } sources in the southern sky observed by the Submillimeter Wave Astronomy Satellite (ortho-{ \rm{H$_2$O} } 1 $_{10}$ -- 1 $_{01}$ line, 556.936~GHz). The typical molecular clumps in our sample have H $_2$ column densities of $10 ^{22}$ to $10 ^{23}$ {\,}cm $^{-2}$ and ortho-{ \rm{H$_2$O} } abundances of 10 $^{-10}$ . Compared with previous studies, the ortho-{ \rm{H$_2$O} } abundances are at a low level, which can be caused by the low temperatur…
Radio Properties of Narrow-Line and Broad-Line Seyfert 1 Galaxies
HUN-REN Research Centre for Astronomy and Earth Sciences（匈牙利研究科学院天文学与地球科学研究中心）；Konkoly Observatory（孔科利天文台）；HUN-REN--ELTE Extragalactic Astrophysics Research Group（匈牙利研究科学院-厄特沃什·洛兰大学河外天体物理学研究组）；Nicolaus Copernicus University（尼古拉·哥白尼大学）；HUN-REN--SZTE Stellar Astrophysics Research Group（匈牙利研究科学院-塞格德大学恒星天体物理学研究组）
A Parsec-Scale Transient High-Frequency-Peaked Radio Source in the Very Large Array Sky Survey Brightening and Fading over a Decadal Timescale
David A. Dunlap Department of Astronomy & Astrophysics, University of Toronto（多伦多大学戴维·A·邓普天文学与天体物理学系）；Dunlap Institute for Astronomy & Astrophysics, University of Toronto（多伦多大学邓普天文学与天体物理学研究所）；Department of Astronomy and Astrophysics, University of California, Santa Cruz（加州大学圣克鲁兹分校天文学与天体物理学系）；National Radio Astronomy Observatory（美国国家射电天文台）
Painting a full radio sky -- Empirical mock catalogues with multiple source populations for future radio surveys
INAF - Institute of Radio Astronomy (IRA)（国家天体物理研究所射电天文研究所）；Scuola Internazionale Superiore di Studi Avanzati (SISSA)（高等高级研究国际学院）；Institute for Fundamental Physics of the Universe (IFPU)（宇宙基础物理研究所）；SKA Organization（平方公里阵列望远镜组织）；Observatoire de la Côte d’Azur (OCA)（蔚蓝海岸天文台）；INAF – Osservatorio di Astrofisica e Scienza dello Spazio (OAS)（国家天体物理研究所天体物理学与空间科学观测站）；Astronomical Observatory of the Autonomous Region of Aosta Valley (OAVdA)（瓦莱达奥斯塔自治大区天文台）；INAF - Institute of Space Astrophysics and Cosmic Physics (IASF)（国家天体物理研究所空间天体物理学与宇宙物理学研究所）
